Kongsberg to Deliver ASW, Diver Detection Sonars for Finnish Navy Pohjanmaa-Class Corvettes

Kongsberg Maritime has received a contract to deliver Anti-Submarine Warfare (ASW) and diver detection sonars for the Pohjanmaa-class corvettes currently being developed by the Finnish Navy under its Squadron 2020 project, the company announced.

The contract was signed with Swedish company Saab that was earlier selected as the combat system provider and integrator for the Squadron 2020 program.

Under the terms of the contract, which equates to approximately 100MNOK, KONGSBERG will equip the Pohjanmaa-class vessels with its SS2030 and SD9500 sonars, both of which boast acoustic properties which make them ideally suited for deployment in shallow-water environments.

The SS2030, principally devised for ASW operations and capable of detecting torpedoes or other small objects in the water column, is an active hull-mounted sonar which utilizes sophisticated tracking algorithms. Its electronically-stabilized transmitting and receiving beams can be tilted to adjust to challenging sound speed profiles, with its integrated Sound Propagation Model determining the optimal tilt settings and enhancing the Probability of Detection (PoD) ratio.

The SS2030 sonars will be delivered to the Finnish Navy complete with hoist-able hull units and ice protection to ensure safe and efficient operation in the often harsh conditions of the Baltic Sea.

The SD9500, meanwhile, is a light and compact over-the-side dipping sonar with outstanding horizontal and vertical positioning capabilities for diver detection, ASW duties and volumetric survey assignments in shallow, reverberation-limited waters.

“We are very pleased to have been selected for another sonar program for the Finnish Navy and to further strengthen our position as a principal supplier of shallow-water ASW, diver detection and mine-hunting equipment,” says Thomas H Dahle, Director of Sales at KONGSBERG.

“The armed forces, as with all defence industries, have to rely upon the most advanced technology available in order to fulfil their responsibilities effectively, and this new naval contract is another resounding testimony to the deep level of trust the KONGSBERG brand has accumulated over our many successful years of trading.”

Finnish Navy Pohjanmaa-class corvettes

The Pohjanmaa class is a class of four multi-role corvettes currently under development for the Finnish Navy as part of the Squadron 2020 (Finnish: Laivue 2020) project. The construction of the vessels is scheduled to begin in 2022 and the four-strong squadron is expected to achieve operational readiness by 2028.

Finnish Navy Pohjanmaa-Class Corvettes
Rendering of the Pohjanmaa-class corvettes currently under development for the Finnish Navy as part of the Squadron 2020 (Finnish: Laivue 2020) project.

The corvettes, along with the four Hamina-class missile boats that are being upgraded, will form the backbone of the Finnish Navy from the mid-2020s. The vessels will replace seven older vessels that have been or are due to be decommissioned: the Pohjanmaa minelayer, two Hämeenmaa-class minelayers, and four Rauma-class missile boats.

The new vessels are to be constructed at the Rauma Marine Constructions (RMC) shipyard in Rauma, Finland.

The Pohjanmaa-class corvettes will have an overall length of 114 m, a beam of 16 m and a displacement of 3,900 tonnes. The class incorporates some major features including ice-strengthened hull.

The corvettes will be armed with Bofors 57 mm naval gun, Evolved Seasparrow Missile (ESSM) surface-to-air missiles, Gabriel anti-ship missiles, Torped 47 anti-submarine torpedoes, and sea mines. They will also be equipped with two Saab Trackfire remote weapon stations (RWS) and two NSV 12.7mm caliber heavy machine guns (HMG).

The vessels are to be equipped with a flight deck and a hangar that can accommodate either a helicopter or UAVs. Each ship will have a crew complement of 70–120.

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